// 混合的标记

.sjx(@_){
    width: 0px;
    height: 0px;
    border-width: 100px;
    border-style: solid;
}
// Down
.sjx(Down,@color:red){
   
    border-color:@color transparent transparent transparent;
    
}

.sjx(Left,@color:red){

    border-color: transparent @color  transparent transparent;
   
}

.sjx(Up,@color:red){
    border-color: transparent transparent @color transparent;
   
}


.sjx(Right,@color:red){
    border-color: transparent transparent  transparent @color;
    
}